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问题 单项选择题

不符合室性早搏心电图特点的是( )

A．提前的QRS波，其前无相关的P波
B．QRS波宽大畸形
C．T波与QRS主波方向相反
D．代偿间歇完全
E．有时可伴差异性传导

答案

参考答案：E

单项选择题

Crops can be traded on the futures market before they are harvested. If a poor corn harvest is predicted, prices of corn futures rise; if a bountiful corn harvest is predicted, prices of corn futures fall. This morning meteorologists are predicting much-needed rain for the corn-growing region starting tomorrow. Therefore, since adequate moisture is essential for the current crop’s survival, prices of corn futures will fall sharply today.
Which of the following, if true, most weakens the argument above

A．Corn that does not receive adequate moisture during its critical pollination stage will not produce a bountiful harvest.

B．Futures prices for corn have been fluctuating more dramatically this season than last season.

C．The rain that meteorologists predicted for tomorrow is expected to extend well beyond the corn-growing region.

D．Agriculture experts announced today that a disease that has devastated some of the corn crop will spread widely before the end of the growing season.

E．(E) Most people who trade in corn futures rarely take physical possession of the corn they trade.
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单项选择题

RFID的防碰撞算法中哪个应用最广泛？（）

A.SDMA

B.FDMA

C.TDMA

D.CDMA
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